A last-minute cancellation (colloquial). Cancelling plans or an appointment shortly before the scheduled time, often inconveniencing others.
友達にドタキャンされて一人で映画に行った。
My friend canceled at the last minute, so I went to the movie alone.
コンサートの前日にドタキャンがあって準備が大変だった。
There was a last-minute cancellation the day before the concert, so preparations were difficult.
ドタキャンすると相手に迷惑がかかる。
A last-minute cancellation inconveniences the other person.